AELAB | Analytical Equipment | Dumas Nitrogen/Protein Analyzer
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Dumas Analyzers are advanced instruments designed for rapid and precise nitrogen and protein determination using the combustion-based Dumas method. Unlike the traditional Kjeldahl method, which relies on chemical digestion, the Dumas approach provides a high-speed, fully automated, and eco-friendly solution for analyzing nitrogen content in organic materials. This technique is widely used in food, feed, agricultural, and biochemical laboratories to ensure accurate protein content determination and compliance with global standards. With fast analysis times, minimal reagent use, and high reproducibility, Dumas Analyzers have become a preferred choice for laboratories that demand efficiency, accuracy, and safety in nitrogen and protein analysis.
A Dumas Analyzer is a combustion-based nitrogen and protein analyzer that quantifies total nitrogen in a sample by measuring nitrogen gas released during high-temperature oxidation. Operating at temperatures above 900°C, these instruments convert organic nitrogen compounds into nitrogen gas, which is detected by a thermal conductivity detector (TCD). This fully automated process delivers fast, accurate, and reproducible results without the need for corrosive reagents, making it ideal for high-throughput laboratories focused on precision and safety.
| Feature | Specification |
|---|---|
| Analysis Method | Combustion at >900°C (Dumas method) |
| Detection System | Thermal Conductivity Detector (TCD) |
| Analysis Time | 3–5 minutes per sample |
| Sample Size Range | 1–300 mg depending on material type |
| Automation | Fully automated with autosampler and software integration |
| Gas Requirements | High-purity oxygen and carrier gas (helium or argon) |
| Accuracy / Reproducibility | ±0.1% relative standard deviation |
| Compliance | AOAC, ISO, and official protein determination standards |
| Aspect | Dumas Analyzer | Kjeldahl Analyzer |
|---|---|---|
| Analysis Time | 3–5 minutes | 1–2 hours |
| Chemical Use | None (combustion gases) | Uses acids and toxic reagents |
| Automation | Fully automated | Manual or semi-automated |
| Accuracy & Reproducibility | High | Moderate |
| Operational Cost | Low (long-term) | Moderate to high |
| Initial Investment | High | Low to moderate |
Q: Is the Dumas method officially recognized for protein analysis?
A: Yes. It is approved by international organizations including AOAC and ISO for total nitrogen and protein determination.
Q: What types of samples can be analyzed with a Dumas Analyzer?
A: It is suitable for organic materials such as food, feed, soil, and biological tissues, as well as some industrial and agricultural samples.
Q: Does the Dumas method differentiate between protein and non-protein nitrogen?
A: No, it measures total nitrogen, including both protein and non-protein nitrogen sources.
Q: How often should a Dumas Analyzer be calibrated?
A: Calibration should be performed regularly using reference materials with known nitrogen values to ensure accuracy.
Dumas Analyzers comply with major laboratory and food testing standards such as AOAC, ISO, and CE. AELAB provides full support for calibration, maintenance, and documentation to help laboratories maintain traceable and reliable analytical performance.
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